A laminar liquid jet in another immiscible liquid call either expand or contract depending oil the physical properties of the systems. The diameter of the drops produced as a result of the disintegration of the jet is a function of the jet diameter at the point of breakup. Thus, in order to calculate the drop diameter and interfacial area, it is essential to have a knowledge of jet breakup length. This article attempts to predict jet breakup length in liquid-liquid systems by applying the stability theories by Rayleigh and Tomotika. The effects of small nozzle diameter, nozzle velocity, and viscosity of the continuous phase on jet breakup length are reported.